[wp-hackers] store all revisions of user metadata in wordpress - possible?

[Gregory Lancaster]

i spend the last seven hours trying to find a to store all revisions of
*user* metadata. the idea is to allow a user to submit an update via form,
and maintain a historical record of all previous updates on a specific
page.

i have tried auto incrementing the meta_key and meta_id without success, as
well as several other strange variations in functions.php.  is it possible
to keep a historical record in this way, and display it visually along with
the date each was submitted?